Android: CountDownTimer skips last onTick()!

Question

Code:

public class SMH extends Activity {  

    public void onCreate(Bundle b) {  
        super.onCreate(b);  
        setContentView(R.layou         


        

Answer 1

I also faced the same issue with CountDownTimer and I tried different approaches. So one of the easiest ways is in solution provided by @Nantoca - he suggests to double the frequency from 1000ms to 500ms. But I don't like this solution because it makes more work which will consume some extra battery resource.

So I decided to use @ocanal's soultion and to write my own simple CustomCountDownTimer.

But I found couple of flaws in his code:

1. It's a bit inefficient (creating second handler to publish results)

2. It starts to publish first result with a delay. (You need to do a post() method rather than postDelayed() during first initialization)

3. odd looking. Methods with capital letter, status instead of classic isCanceled boolean and some other.

So I cleaned it a bit and here is the more common version of his approach:

private class CustomCountDownTimer {

    private Handler mHandler;
    private long millisUntilFinished;
    private long countDownInterval;
    private boolean isCanceled = false;

    public CustomCountDownTimer(long millisUntilFinished, long countDownInterval) {
        this.millisUntilFinished = millisUntilFinished;
        this.countDownInterval = countDownInterval;
        mHandler = new Handler();
    }

    public synchronized void cancel() {
        isCanceled = true;
        mHandler.removeCallbacksAndMessages(null);
    }

    public long getRemainingTime() {
        return millisUntilFinished;
    }

    public void start() {

        final Runnable counter = new Runnable() {

            public void run() {

                if (isCanceled) {
                    publishUpdate(0);
                } else {

                    //time is out
                    if(millisUntilFinished <= 0){
                        publishUpdate(0);
                        return;
                    }

                    //update UI:
                    publishUpdate(millisUntilFinished);

                    millisUntilFinished -= countDownInterval;
                    mHandler.postDelayed(this, countDownInterval);
                }
            }
        };

        mHandler.post(counter);
    }
}